Check basic fuses first.
If the button that works the defogger lights up continue reading.
Many Impalas and Malibus have wiring that corrodes by the passenger side kick panel along the lower side A pillar. There is a connector with many pins that gets ruined. I dunno if malibus have a fuse box here as well like the impalas, but check there. might have to sneak a peek under the carpet. but it takes like 15 minute to check.
very common for defoggers that dont work when the fuses are good and the button lights up.
SOURCE: stereo not working (no sound) as well as rear defogger
i was told if you put in an after market stereo, you need that GMOS-04 connection. It costs like $100.00. as far as defogger, idk. hope it helps
SOURCE: my rear defogger doesn''t work on 2003 monte carlo
check the wires where they connect and plug in on both corners of rear window...sometimes they break off and lose contact ....they can be reglued on using a special glue that will conduct electrical current through it...can be found at most auto parts srores...good luck....Lee
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Liftgate module (LGM)/endgate module (EGM)
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Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
DTC B0283 Electric Rear Defrost Circuit - do you know what DTC'S - diagnostic trouble code's are ?
Circuit Description
The liftgate module (LGM)/endgate module (EGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. The LGM/EGM test the supply voltage circuit of the rear window defogger every 160 milliseconds. With the rear window defogger inactive, the supply voltage circuit of the rear window defogger will have no voltage present. With the rear window defogger active, the supply voltage circuit of the rear window defogger will be near system voltage.
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